macvlan 网络模式实现跨主机 Docker 通信

macvlan 网络模式实现跨主机 Docker 通信

macvlan 网络模式概念

macvlan 本身是 linux 内核的模块,本质上是一种网卡虚拟化的技术,其功能是允许在同一个物理网卡上虚拟出多个网卡,通过不同的 MAC 地址在数据链路层进行网络数据的转发。

一块网卡上配置多个 MAC 地址,即多个接口,每个接口都可以配置自身的 IP 地址。Docker 的 macvlan 网络实际上就是使用了 Linux 提供的 macvlan 驱动功能。

因为多个 MAC 地址的网络数据包都是从同一个网卡上传输,因此需要打开网卡的混杂模式,即 ip link set eth0 promisc on

在 Docker 下创建 macvlan 网络不同于创建 bridge 网络模式,需要指定网段与网关,且网段与网关需是物理上存在的。

macvlan 网络模式不依赖于网桥,所以使用 brctl show 将看到并没有创建新的网桥。但是查看容器内的网络,将会看到每个虚拟网卡都对应一个容器外部的接口。

/ # ip addr
1: lo:  mtu 65536 qdisc noqueue qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
627: eth2@if3:  mtu 1500 qdisc noqueue
    link/ether 02:42:c0:a8:54:e1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.84.225/24 scope global eth2
       valid_lft forever preferred_lft forever
    inet6 fe80::42:c0ff:fea8:54e1/64 scope link
       valid_lft forever preferred_lft forever
628: eth1@if4:  mtu 1500 qdisc noqueue
    link/ether 02:42:c0:a8:55:e1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.85.225/24 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::42:c0ff:fea8:55e1/64 scope link
       valid_lft forever preferred_lft forever
629: eth0@if2:  mtu 1500 qdisc noqueue
    link/ether 02:42:c0:a8:53:e1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.83.225/24 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::42:c0ff:fea8:53e1/64 scope link
       valid_lft forever preferred_lft forever
/ #

比如,以上是在容器内执行 ip addr 指令后显示的各个虚拟网口内容。比如虚拟网口显示“629: eth0@if2”,其中 if2 表示物理网卡的编号为 2 的网口,即如下所示,编号为 2 的网口即 eth0 网口。

[root@jamza_vm_lp0_litepaas master]# ip addr
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:83:cc:dd:00 brd ff:ff:ff:ff:ff:ff
    inet 192.168.83.85/24 brd 192.168.83.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:83ff:fecc:dd00/64 scope link
       valid_lft forever preferred_lft forever

网段规划

查看宿主机的网口信息:

[root@jamza_vm_master_litepaas master]# ifconfig
docker0: flags=4099  mtu 1500
        inet 172.17.6.252  netmask 255.255.255.0  broadcast 0.0.0.0
        inet6 fe80::42:c6ff:fe05:2363  prefixlen 64  scopeid 0x20
        ether 02:42:c6:05:23:63  txqueuelen 0  (Ethernet)
        RX packets 570  bytes 35680 (34.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 223  bytes 19338 (18.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

docker_gwbridge: flags=4099  mtu 1500
        inet 172.18.0.1  netmask 255.255.240.0  broadcast 0.0.0.0
        inet6 fe80::42:42ff:fe41:eebc  prefixlen 64  scopeid 0x20
        ether 02:42:42:41:ee:bc  txqueuelen 0  (Ethernet)
        RX packets 3574777  bytes 185891316 (177.2 MiB)
        RX errors 0  dropped 15  overruns 0  frame 0
        TX packets 1530  bytes 99712 (97.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth0: flags=4163  mtu 1500
        inet 192.168.83.83  netmask 255.255.255.0  broadcast 192.168.83.255
        inet6 fe80::5054:83ff:feaa:bb00  prefixlen 64  scopeid 0x20
        ether 52:54:83:aa:bb:00  txqueuelen 1000  (Ethernet)
        RX packets 83683524  bytes 364816891747 (339.7 GiB)
        RX errors 0  dropped 15  overruns 0  frame 0
        TX packets 94961933  bytes 213362123667 (198.7 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth20: flags=4163  mtu 1500
        inet 192.168.84.83  netmask 255.255.255.0  broadcast 192.168.84.255
        inet6 fe80::5054:83ff:feaa:bb20  prefixlen 64  scopeid 0x20
        ether 52:54:83:aa:bb:20  txqueuelen 1000  (Ethernet)
        RX packets 10698672  bytes 712975406 (679.9 MiB)
        RX errors 0  dropped 7120862  overruns 0  frame 0
        TX packets 1773  bytes 122490 (119.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth21: flags=4163  mtu 1500
        inet 192.168.85.83  netmask 255.255.255.0  broadcast 192.168.85.255
        inet6 fe80::5054:83ff:feaa:bb21  prefixlen 64  scopeid 0x20
        ether 52:54:83:aa:bb:21  txqueuelen 1000  (Ethernet)
        RX packets 3574777  bytes 185891316 (177.2 MiB)
        RX errors 0  dropped 15  overruns 0  frame 0
        TX packets 1530  bytes 99712 (97.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1  (Local Loopback)
        RX packets 34518600  bytes 4376071963 (4.0 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 34518600  bytes 4376071963 (4.0 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

宿主机包含三个物理网卡,分别是 eth0、eth20 与 eth21,因此规划建立 3 个 macvlan 模式网络,考虑主控与线卡的 macvlan 模式网络为同一网段,为防止主控与线卡上的网段重合,通过 ip-range 选项设定主控与线卡的 ip 地址池,具体规划如下:

网络 1 规划

net_name:rcm_net1

subnet:192.168.83.0/24

gateway:192.168.83.1

parent_interface:eth0

ip_range:192.168.83.240/28(master) 192.168.83.224/28(lp)

网络 2 规划

net_name:rcm_net2

subnet:192.168.84.0/24

gateway:192.168.84.1

parent_interface:eth20

ip_range:192.168.84.240/28(master) 192.168.84.224/28(lp)

网络 3 规划

net_name:rcm_net3

subnet:192.168.85.0/24

gateway:192.168.85.1

parent_interface:eth21

ip_range:192.168.85.240/28(master) 192.168.85.224/28(lp)

网络建立

网络建立之前,主控系统的 docker 网络列表如下:

[root@jamza_vm_master_litepaas master]# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
a78327e048e0        bridge              bridge              local
b919f69968ec        docker_gwbridge     bridge              local
032c767b11de        host                host                local
cad8d79e6d05        none                null                local
[root@jamza_vm_master_litepaas master]#

通过 docker network create 命令,建立 macvlan 网络模式,如下:

[root@jamza_vm_master_litepaas master]# docker network create -d macvlan --subnet=192.168.83.0/24 --gateway=192.168.83.1 --ip-range=192.168.83.240/28 -o parent=eth0 rcm_net1
a3db1d77c949c20638d04fc0049e6522e318ff0dc6f647b609ab3196ee9ef50b
[root@jamza_vm_master_litepaas master]#
[root@jamza_vm_master_litepaas master]# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
a78327e048e0        bridge              bridge              local
b919f69968ec        docker_gwbridge     bridge              local
032c767b11de        host                host                local
cad8d79e6d05        none                null                local
a3db1d77c949        rcm_net1            macvlan             local
[root@jamza_vm_master_litepaas master]#
[root@jamza_vm_master_litepaas master]# docker network inspect rcm_net1
[
    {
        "Name": "rcm_net1",
        "Id": "a3db1d77c949c20638d04fc0049e6522e318ff0dc6f647b609ab3196ee9ef50b",
        "Created": "2019-07-31T13:38:59.184319993+08:00",
        "Scope": "local",
        "Driver": "macvlan",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "192.168.83.0/24",
                    "IPRange": "192.168.83.240/28",
                    "Gateway": "192.168.83.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Containers": {},
        "Options": {
            "parent": "eth0"
        },
        "Labels": {}
    }
]
[root@jamza_vm_master_litepaas master]#

同理,创建另外两个 macvlan 网络:

[root@jamza_vm_master_litepaas master]# docker network create -d macvlan --subnet=192.168.84.0/24 --gateway=192.168.84.1 --ip-range=192.168.84.240/28 -o parent=eth20 rcm_net2
b95e405b383d0b3c6035c9f7ea556f315def34d9d4cf290f7ca2ba6272341d20
[root@jamza_vm_master_litepaas master]#
[root@jamza_vm_master_litepaas master]# docker network create -d macvlan --subnet=192.168.85.0/24 --gateway=192.168.85.1 --ip-range=192.168.85.240/28 -o parent=eth21 rcm_net3
2fe74eed7b69033582cfa44ba4d16f06feee0b1f56234d0640948da81f9674bc
[root@jamza_vm_master_litepaas master]#
[root@jamza_vm_master_litepaas master]# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
a78327e048e0        bridge              bridge              local
b919f69968ec        docker_gwbridge     bridge              local
032c767b11de        host                host                local
cad8d79e6d05        none                null                local
a3db1d77c949        rcm_net1            macvlan             local
b95e405b383d        rcm_net2            macvlan             local
2fe74eed7b69        rcm_net3            macvlan             local
[root@jamza_vm_master_litepaas master]#

在线卡主机上也创建同样的三个网络,区别是 ip 地址池不同:

[root@jamza_vm_lp0_litepaas master]# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
eae88252b139        bridge              bridge              local
bd5b745fb87f        docker_gwbridge     bridge              local
a20b3d67c74d        host                host                local
d8bdffcb4f6e        none                null                local
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker network create -d macvlan --subnet=192.168.83.0/24 --gateway=192.168.83.1 --ip-range=192.168.83.224/28 -o parent=eth0 rcm_net1
afc8a5c72b2a87b89837cc096b8b4d6fcf312b83ef578bf05bc6be8fce4c0b7c
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker network create -d macvlan --subnet=192.168.84.0/24 --gateway=192.168.84.1 --ip-range=192.168.84.224/28 -o parent=eth20 rcm_net2
9a6fda4d7da07317dad8edb3fdb2595a986631a5e2211ecf02f422bddc6de12b
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker network create -d macvlan --subnet=192.168.85.0/24 --gateway=192.168.85.1 --ip-range=192.168.85.224/28 -o parent=eth21 rcm_net3
13f9679e4f1a521ed1506bb41b65340f9775e6bde0669192874b0c58f6822b33
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
eae88252b139        bridge              bridge              local
bd5b745fb87f        docker_gwbridge     bridge              local
a20b3d67c74d        host                host                local
d8bdffcb4f6e        none                null                local
afc8a5c72b2a        rcm_net1            macvlan             local
9a6fda4d7da0        rcm_net2            macvlan             local
13f9679e4f1a        rcm_net3            macvlan             local
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker network inspect rcm_net1
[
    {
        "Name": "rcm_net1",
        "Id": "afc8a5c72b2a87b89837cc096b8b4d6fcf312b83ef578bf05bc6be8fce4c0b7c",
        "Created": "2019-07-31T13:46:03.832634708+08:00",
        "Scope": "local",
        "Driver": "macvlan",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "192.168.83.0/24",
                    "IPRange": "192.168.83.224/28",
                    "Gateway": "192.168.83.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Containers": {},
        "Options": {
            "parent": "eth0"
        },
        "Labels": {}
    }
]
[root@jamza_vm_lp0_litepaas master]#

创建连接至 macvlan 的 Docker 容器

在主控环境创建连接至三个 macvlan 网络的 Docker 容器,容器中已经创建了三个网卡,分别对应连接的三个 macvlan 网络,其 ip 地址也是对应的网段的 ip 地址池范围内的:

[root@jamza_vm_master_litepaas master]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@jamza_vm_master_litepaas master]#
[root@jamza_vm_master_litepaas master]# docker create -it --privileged=true --net rcm_net1 --name test busybox/x86_64:latest /bin/sh
4c4a70764b65f043a5ab6d37d5a49a38eab4fcaa3d2fb46adffcd0afe8f55559
[root@jamza_vm_master_litepaas master]#
[root@jamza_vm_master_litepaas master]# docker network connect rcm_net2 test
[root@jamza_vm_master_litepaas master]#
[root@jamza_vm_master_litepaas master]# docker network connect rcm_net3 test
[root@jamza_vm_master_litepaas master]#
[root@jamza_vm_master_litepaas master]# docker start -i test
/ #
/ # ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:C0:A8:53:F0
          inet addr:192.168.83.240  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::42:c0ff:fea8:53f0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:578 (578.0 B)

eth1      Link encap:Ethernet  HWaddr 02:42:C0:A8:54:F0
          inet addr:192.168.84.240  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::42:c0ff:fea8:54f0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:578 (578.0 B)

eth2      Link encap:Ethernet  HWaddr 02:42:C0:A8:55:F0
          inet addr:192.168.85.240  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::42:c0ff:fea8:55f0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:578 (578.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/ #

同理,在线卡主机环境中,创建连接至三个 macvlan 网络的 Docker 容器:

[root@jamza_vm_lp0_litepaas master]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker create -it --privileged=true --net rcm_net1 --name test busybox/x86_64:latest /bin/sh
9335b9268b7554476727749823e15530fb94b424ec8fb122f308724ac3250036
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker network connect rcm_net2 test
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker network connect rcm_net3 test
[root@jamza_vm_lp0_litepaas master]#
[root@jamza_vm_lp0_litepaas master]# docker start -i test
/ #
/ # ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:C0:A8:53:E0
          inet addr:192.168.83.224  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::42:c0ff:fea8:53e0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:508 (508.0 B)

eth1      Link encap:Ethernet  HWaddr 02:42:C0:A8:54:E0
          inet addr:192.168.84.224  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::42:c0ff:fea8:54e0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:508 (508.0 B)

eth2      Link encap:Ethernet  HWaddr 02:42:C0:A8:55:E0
          inet addr:192.168.85.224  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::42:c0ff:fea8:55e0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:508 (508.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/ #

主控与线卡环境中容器 ping 测试

在主控环境中的容器内,ping 线卡环境中的容器 ip 地址,以及在线卡环境中的容器内,ping 主控环境中的容器 ip 地址,显示均能够 ping 通:

#主控环境中的容器内,ping线卡环境上的容器ip地址
/ #
/ # ping 192.168.83.224
PING 192.168.83.224 (192.168.83.224): 56 data bytes
64 bytes from 192.168.83.224: seq=0 ttl=64 time=0.421 ms
64 bytes from 192.168.83.224: seq=1 ttl=64 time=0.544 ms
64 bytes from 192.168.83.224: seq=2 ttl=64 time=0.412 ms
64 bytes from 192.168.83.224: seq=3 ttl=64 time=0.383 ms
^C
--- 192.168.83.224 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.383/0.440/0.544 ms
/ #
/ # ping 192.168.84.224
PING 192.168.84.224 (192.168.84.224): 56 data bytes
64 bytes from 192.168.84.224: seq=0 ttl=64 time=0.458 ms
64 bytes from 192.168.84.224: seq=1 ttl=64 time=0.586 ms
64 bytes from 192.168.84.224: seq=2 ttl=64 time=0.560 ms
64 bytes from 192.168.84.224: seq=3 ttl=64 time=0.333 ms
^C
--- 192.168.84.224 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.333/0.484/0.586 ms
/ #
/ # ping 192.168.85.224
PING 192.168.85.224 (192.168.85.224): 56 data bytes
64 bytes from 192.168.85.224: seq=0 ttl=64 time=0.341 ms
64 bytes from 192.168.85.224: seq=1 ttl=64 time=0.465 ms
64 bytes from 192.168.85.224: seq=2 ttl=64 time=0.266 ms
64 bytes from 192.168.85.224: seq=3 ttl=64 time=0.514 ms
^C
--- 192.168.85.224 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.266/0.396/0.514 ms
/ #

#线卡环境中的容器内,ping主控环境上的容器ip地址
/ #
/ # ping 192.168.83.240
PING 192.168.83.240 (192.168.83.240): 56 data bytes
64 bytes from 192.168.83.240: seq=0 ttl=64 time=0.428 ms
64 bytes from 192.168.83.240: seq=1 ttl=64 time=0.415 ms
64 bytes from 192.168.83.240: seq=2 ttl=64 time=0.384 ms
64 bytes from 192.168.83.240: seq=3 ttl=64 time=0.455 ms
^C
--- 192.168.83.240 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.384/0.420/0.455 ms
/ #
/ # ping 192.168.84.240
PING 192.168.84.240 (192.168.84.240): 56 data bytes
64 bytes from 192.168.84.240: seq=0 ttl=64 time=0.356 ms
64 bytes from 192.168.84.240: seq=1 ttl=64 time=0.372 ms
64 bytes from 192.168.84.240: seq=2 ttl=64 time=0.415 ms
64 bytes from 192.168.84.240: seq=3 ttl=64 time=0.501 ms
^C
--- 192.168.84.240 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.356/0.411/0.501 ms
/ #
/ # ping 192.168.85.240
PING 192.168.85.240 (192.168.85.240): 56 data bytes
64 bytes from 192.168.85.240: seq=0 ttl=64 time=0.241 ms
64 bytes from 192.168.85.240: seq=1 ttl=64 time=0.340 ms
64 bytes from 192.168.85.240: seq=2 ttl=64 time=0.449 ms
64 bytes from 192.168.85.240: seq=3 ttl=64 time=0.286 ms
^C
--- 192.168.85.240 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.241/0.329/0.449 ms
/ #

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